Effect of composite amendments on physicochemical properties of copper tailings repaired by herbaceous plants

Min, He; Xue, Jinchun; You, Jiajia; Han, Huaqin; Qian, Hui; Wang, Xiaojuan

doi:10.1007/s11356-022-23606-4

Cited by 7 publications

(4 citation statements)

References 71 publications

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“…[ 7 ] Straw is a slow‐release resource that not only supplies NPK and other nutrients essential for plant development, but also lowers BD and enhances tailings' thermal insulation, water retention, and air permeability. [ 6 ]…”

Section: Resultsmentioning

confidence: 99%

“…However, there are few feasible examples of direct phytoremediation as the physical and chemical characteristics of tailings differ greatly from those of normal mature soil, and are insufficient for most plants to survive. [ 6 ] Since nearly all of the nutrients in raw ore are lost during the deep grinding of flotation activity, it is essential to add nutrients to the tailings for phytoremediation. Additionally, excessive levels of potentially toxic elements and organic contaminants found in tailings may inhibit plant root development, result in leaf chlorosis, and reduce biomass output.…”

Section: Introductionmentioning

confidence: 99%

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Soilless remediation of the fine carbonate‐rich gold‐copper mine tailings

Xia,

Bi,

Cui

et al. 2023

CLEAN Soil Air Water

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Soil remediation with minimum amendments is a good strategy for tailings disposal. Carbonate‐rich gold‐copper mine tailings occurring alongside the Yangzi River, China, were employed as the objective in this study. They showed the characteristics of fine particles and alkaline pH with high density and low nutrition. The amendments including bacterial fertilizer (BF), polymer, peat, straw, and compound fertilizer (CF) were used for soilless remediation on the tailings. Soil quality index (SQI) involved in tailing properties and growth characteristics of ryegrass was used to optimize the combination of amendments. The results showed that the optimum amendment combination was 0.2% BF + 0.6% CF + 0.2% polymer + 10% peat and 2% straw. Tailing nutrients such as soil organic matter (5.56%), available nitrogen (93.6 mg kg−1), available phosphorus (51.7 mg kg−1), available potassium (711 mg kg−1), and ryegrass exhibited the highest germination rate and biomass level under the optimal improvement conditions. Additional environmental assessments revealed that soilless treatment of the tailings helped to convert Cu, Zn, and As into residual forms. These findings show a good strategy for tailings soil improvement and provide a promising perspective of the soilless remediation for fine carbonate‐rich metal tailings.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soilless remediation of the fine carbonate‐rich gold‐copper mine tailings

Xia,

Bi,

Cui

et al. 2023

CLEAN Soil Air Water

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“…Sudan grass, ryegrass and Bermuda grass were the plant raw materials, and the seeds were purchased from Jiangsu Qianhua Baimei Seed Industry Co., Ltd. There have been a lot of studies and elaboration on the preparation and application of conditioner for copper tailings fertilizer restoration by the previous staff of the research group (Wang et al 2023). The conditioner preparation and determination process for fertilizer restoration and subsequent application methods are not described here.…”

Section: Experimental Materialsmentioning

confidence: 99%

Phytoremediation of multi-metal contaminated copper tailings with herbaceous plant and composite amendments

Wang

Xue

You

et al. 2023

Preprint

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After the closure of the large tailing pond of copper sulfide mine, ecological restoration must be carried out. The ecological restoration method of directly using tailing as a vegetation matrix to replace guest soil is a new method. The key to this method lies in improving the substrate environment and carry out phytoremediation. A field test was performed to carry out an enhanced phytoremediation technique for multi-metal contaminated copper tailings by Sudan grass (Sorghum sudanense (Piper) Stapf.), ryegrass (Lolium perenne L.), and Bermuda grass (Cynodon dactylon), using conditioner (TH-LZ01) and straw combination into composite amendments as soil amendments, aimed to obtain the maximum of phytoremediation effect. The 5% conditioner and 0.5% straw (C2S2) were recommended as the optimum chemical proportions for amendment materials. We could find that the chlorophyll, catalase activity, plant length and fresh weight in the 5% conditioner and 0.5% straw (C2S2) applied treatments were notably higher when compared with those of other treatments, indicating that composite amendments could alleviate the toxicity of metals to plants. In addition, adding composite amendments can obviously improve the restoration effect of Sudan grass, ryegrass and Bermuda grass on the pH, water content, electrical conductivity and organic matter of copper tailings. Compared with no treatment, the absorption of metal in leaves of plants treated with composite amendments is lower, but that in roots is enhanced, revealing that the stability of metal in roots is enhanced by composite amendments treatment to a great extent. By applying composite amendments, the metal removal effect of ryegrass appeared to be particularly effective, and by the following order: Cd (48.5%) > Zn (45.8%) > Pb (27.7%) > Cu (21.9%), followed by Sudan grass and Bermuda grass.

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“…Previous studies have reported its use as a restorative plant for copper tailings 31 . In order to explore the effects of biodegradable chelating agents on plant extraction of Cu and Cd in copper tailings, this study takes the copper tailings from the 4# tailings pond of Dexing Copper Mine in Jiangxi Province as the research object, and through pot experiments, investigates the effects of different concentrations of chelating agents PASP, CA, or FA on the remediation efficiency of ryegrass plants, revealing their potential mechanisms on plant remediation efficiency, and then selecting the most ideal chelating agent and application ratio.…”

Section: Introductionmentioning

confidence: 99%

Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents

Wang,

Xue,

Zhang

et al. 2024

Sci Rep

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Heavy metal contamination is an urgent ecological governance problem in mining areas. In order to seek for a green and environmentally friendly reagent with better plant restoration effect to solve the problem of low efficiency in plant restoration in heavy metal pollution soil. In this study, we evaluated the effects of three biodegradable chelating agents, namely citric acid (CA), fulvic acid (FA) and polyaspartic acid (PASP), on the physicochemical properties of copper tailings, growth of ryegrass (Lolium perenne L.) and heavy metal accumulation therein. The results showed that the chelating agent application improved the physicochemical properties of copper tailings, increased the biomass of ryegrass and enriched more Cu and Cd in copper tailings. In the control group, the main existing forms of Cu and Cd were oxidizable state, followed by residual, weak acid soluble and reducible states. After the CA, FA or PASP application, Cu and Cd were converted from the residual and oxidizable states to the reducible and weak acid soluble states, whose bioavailability in copper tailings were thus enhanced. Besides, the chelating agent incorporation improved the Cu and Cd extraction efficiencies of ryegrass from copper tailings, as manifested by increased root and stem contents of Cu and Cd by 30.29–103.42%, 11.43–74.29%, 2.98–110.98% and 11.11–111.11%, respectively, in comparison with the control group. In the presence of multiple heavy metals, CA, FA or PASP showed selectivity regarding the ryegrass extraction of heavy metals from copper tailings. PCA analysis revealed that the CA-4 and PASP-7 treatment had great remediation potentials against Cu and Cd in copper tailings, respectively, as manifested by increases in Cu and Cd contents in ryegrass by 90.98% and 74.29% compared to the CK group.

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Effect of composite amendments on physicochemical properties of copper tailings repaired by herbaceous plants

Cited by 7 publications

References 71 publications

Soilless remediation of the fine carbonate‐rich gold‐copper mine tailings

Soilless remediation of the fine carbonate‐rich gold‐copper mine tailings

Phytoremediation of multi-metal contaminated copper tailings with herbaceous plant and composite amendments

Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents

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